Question

我有信函的模型，这个模型有两个来自附件和联系人的忘记密钥

public function up()
{
    Schema::create('letters', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('contact_id')->unsigned();
        $table->integer('attachment_id')->unsigned();
        $table->timestamps();
        $table->foreign('contact_id')->references('id')->on('contacts');
        $table->foreign('attachment_id')->references('id')->on('attachments');
    });
}

我这样做。但是当我输入artisan migration SQL时出错

常规错误：1005无法创建表格ss。#sql-1064_4a（错误号码：150＆＃34;异物< 键约束形成错误＆＃34;）（SQL：alter table letters添加约束letters_attach ment_id_foreign外键（attachment_id）引用attachments（id））< / p>

Answer 1

首先创建表行，然后添加forgin键。

   Schema::create('letters', function (Blueprint $table) {
        $table->increments('id');
        $table->integer('contact_id')->unsigned();
        $table->integer('attachment_id')->unsigned();
        $table->timestamps();
    });
       Schema::table('letters', function (Blueprint $table) {
           $table->foreign('contact_id')->references('id')->on('contacts');
        $table->foreign('attachment_id')->references('id')->on('attachments');
        });

我想这会起作用

如何使用laravel migration创建2 forign键

1 个答案: